Suppression Of The Nonlinear Effects In Optical Fiber Communication Systems By Dispersion Management

Nonlinear Kerr effect is one of the impairments of optical fiber communications. Dispersion management is one of the techniques to suppress the nonlinear impairments. In this dissertation, we discuss this technique systematically. The efficiency of dispersion management for countering the nonlinear effects is investigated, and analytical methods are proposed to design and optimize the dispersion managed systems.Dispersion management includes tuning the amounts of precompensation, residual dispersion per span (RDPS), and net residual dispersion (NRD). In order to suppress the nonlinear impairments mostly, the above three parameters need be optimized. For self-phase modulation (SPM)-limited systems, optimizing the NRD is necessary because it can improve the system performance greatly. Unfortunately, analytical model for optimizing NRD is lack. Two different analytical methods, i.e., minimizing the width and maximizing the center amplitude of the output pulse, are presented here to optimize NRD for SPM-limited dispersion-managed systems. An analytical expression of optimized NRD is obtained by the method of minimizing pulse width. This method can also be used to optimize all the three parameters mentioned above simultaneously. The method of maximizing center amplitude is simpler and more straightforward comparing to the first method.Addtionally, establishment database with two system parameters, nonlinear phase shift and product of dispersion parameter and square of bit rate, is proposed to estimate the nonlinear impairments of arbitrary single-channel dispersion-managed systems.